Yes. This shows that any one out of a choice of several characters can match the transition.
Rule 2. Choice of Character
If you want to match one of several characters,
place the characters inside square brackets,
Any number of characters can be put inside the brackets,
however the expression matches just one character at a time.
[abc] matches just one character,
'a' or 'b' or 'c'.
Any number of bracketed groups can appear in a RE.
|Regular Expression||Matches||Does Not Match|
The characters inside the square brackets can appear in any order,
but a given character should appear only once per set of brackets.
[abc] is equivalent to
[aba] is a mistake,
but will usually be regarded as equivalent to
[wW][hH][yY] match wHy ?
(There are no spaces in the regular expression; your web browser might not show this clearly.)